AirHint found the following cheapest return flights from Chiang Mai (CNX) to London (LGW) in September 2025 (see full year).
Return flights
| 27 Sep - 29 Sep | Thai AirAsia | ||
| 23 Sep - 30 Sep | Thai AirAsia | ||
| 22 Sep - 29 Sep | Thai VietJet Air | ||
| 26 Sep - 20 Oct | Nok Air | ||
| 24 Sep - 09 Oct | China Southern |
Also check the deals for one-way flights from Chiang Mai to London in September.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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